EletraTherm commissions Green Machine at Czech biogas plant

By EletraTherm | February 21, 2013

ElectraTherm, a leader in small-scale, waste heat to power generation, installed a Green Machine at a biogas plant in Straznice, Czech Republic. ElectraTherm distributor GB Consulting and biogas plant constructor EnviTec commissioned an ElectraTherm Green Machine to generate additional power and increase energy efficiency on site, and the machine has accrued more than 2,800 hours with greater than 97 percent availability.

The Green Machine was added at a biogas power facility with a GE Jenbacher 412 internal combustion engine producing 844kWe. The installation of the Green Machine is the first of its kind to connect the machine at the beginning of the heat loop, providing the Green Machine with higher waste heat temperatures to increase power output, while maintaining proper heat input to the anaerobic digesters. The addition of the machine reduces the onsite electricity needed to reject excess heat through radiator fans. In combination with the electrical output of the Green Machine, this increases the plant efficiency by up to 8 percent.

ElectraTherm’s patented organic Rankine cycle (ORC) technology begins with hot water entering the Green Machine at 94 degrees Celsius, where it heats a working fluid into a pressurized vapor. The high pressure vapor expands through ElectraTherm’s patented twin screw power block, spinning an electric generator to produce approximately 40kWe at this site. After turning the expander, the vapor is condensed back into liquid through the use of a liquid loop radiator with some heat also being used for nearby district heating.

ElectraTherm’s Green Machine generates fuel-free, emission free power from waste heat, on applications such as biogas, IC engines, biomass, geothermal/co-produced fluids and solar thermal. A fleet map is now available on the ElectraTherm website with details on individual applications, engines and links to case studies.




1 Responses

  1. Yoel



    Peter: Carbon sequestration is a term that awlols a Premier in Western Canada because of a potential future solution. The truth of the matter, is every time they have tried it, there have been leaks back into the atmosphere. I don't think people appreciate the magnitude of this problem. Globally we release 82 million tons of carbon into the atmosphere every day. Mother nature is storing this stuff quite nicely by herself. If we pry it out of the earth and attempt to separate the carbon and put it back in the ground, we would soon run out of places to put it and keeping it all sealed up would become a hugely difficult problem.The oil companies would shut down the oil sands immediately if a competitive bio fuel came on stream and they would probably be the ones to produce it. But there are no market pressures yet.The US Dept of Defense have been doing a lot of work on cheaper bio fuels but nothing has really worked out. A carbon tax would help shift the market pressures toward bio fuel but it needs a lot more development. Probably the carbon tax revenues could be used initially to support more biofuel research.The weird thing is we have green solutions for producing electricity (nuclear is probably best) but there is still a big lobby for Combined Heat and Power with natural gas. Fortunately NIMBY has made that one a little hard to get off the ground too.


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